
CHAPTER 14 SERIAL INTERFACE CHANNEL 0
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(6) Address match detection method
In the SBI mode, the master transmits a slave address to select a specific slave device.
Coincidence of the addresses can be automatically detected by hardware. CSIIF0 is set only when the slave
address transmitted by the master coincides with the address set to SVA when the wake-up function specify
bit (WUP) = 1.
If bit 5 (SIC) of the interrupt timing specify register (SINT) is set to 1, the wake-up function cannot be used
even if WUP is set to 1 (an interrupt request signal is generated when bus release is detected). To use
the wake-up function, clear SIC to 0.
Cautions 1.
Slave selection/non-selection is detected by matching of the slave address received
after bus release (RELD = 1).
For this match detection, match interrupt request (CSIIFO) of the address to be
generated with WUP = 1 is normally used. Thus, execute selection/non-selection
detection by slave address when WUP = 1.
When detecting selection/non-selection without the use of interrupt request with WUP
= 0, do so by means of transmission/reception of the command preset by program
instead of using the address match detection method.
2.
(7) Error detection
In the SBI mode, the serial bus SB0 (SB1) status being transmitted is fetched into the destination device,
that is, the serial I/O shift register 0 (SIO0). Thus, transmit errors can be detected in the following two ways.
(a) Comparison of SIO0 data before transmission to that after transmission
In this case, if two data differ from each other, a transmit error is judged to have occurred.
(b) Use of the slave address register (SVA)
Transmit data is set to both SIO0 and SVA and is transmitted. After termination of transmission, COI
bit (match signal coming from the address comparator) of the serial operating mode register 0 (CSIM0)
is tested. If “1”, normal transmission is judged to have been carried out. If “0”, a transmit error is judged
to have occurred.
(8) Communication operation
In the SBI mode, the master device selects normally one slave device as the communication target from
among two or more devices by outputting an “address” to the serial bus.
After the communication target device has been determined, commands and data are transmitted/ received
and serial communication is realized between the master and slave devices.
Figures 14-19 to 14-22 show data communication timing charts.
Shift operation of the shift register is carried out at the falling edge of the serial clock (SCK0). Transmit
data is latched into the SO0 latch and is output with MSB set as the first bit from the SB0/P25 or SB1/P26
pin.
Receive data input to the SB0 (or SB1) pin at the rising edge of SCK0 is latched into the shift register.